html,
body {
    font-family: 'Helvetica Neue', Helvetica, 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', '微软雅黑', Arial, sans-serif;
    margin: 0;
    padding: 0;
}

div {
    box-sizing: border-box;
}

a {
    text-decoration: none;
    color: #000;
}

ul,
li {
    margin: 0;
    padding: 0;
    list-style: none;
}